The Influence of Zhengzhou City on Boundary Layer Wind

Analysis is carried out of the influence of underlying surface on boundary layer wind in Zhengzhou city,based on the surface and boundary layer data observed synchronously in the observation cite of city center and south suburbs meteorology observation station of Zhengzhou in the January and July 1993. Results show that there is a city system of winds,i.e.,city heat island circulation around Zhengzhou city,in the cloudless and small surface presure gradient condition. In the influence of city heat island sirculation,suburban surface wind is urbanward; under 800m,when wind over urban is westly,wind over south suburban is from its left flank at the same height and when wind over urban is eastly,wind over south suburban is from is right falnk; above 1200m,when it is westly,wind over south suburban is from its right flank.

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